Carburetor



Sept. 14 1926.

Y F. SCHNEEBERGER CARBURET O R Filed Jan. V9, 1925 IIIIIA'III III,

Patented Sept. 14, 1926.

UNITED srarrzs FRITZ SGHNEEBERGER, OF BERNE, SIVITZERLAND. i

CARBURETOR.

Application led January 9, 1923, Serial No. 611,621, and in GermanyGc-tober 12, 1922.

This invention relatesto a carburetor for internal-combustion enginesand of the kind in which the fuel is led from the fio/at chamber to themixing chamber through the throttle valve.

Fig. 1 of the accompanying drawings represents a vertical section of thecarburetor,

Fig. 2, another vertical section taken on the line 2-2 of Fig. 1, and

Fig. 3, a horizontal section taken on the line 3 3 of Fig. l,

Fig. 4 is a vertical section showing the valve body in a differentposition to that of Fig. 1,

Fig. 5 is a vertical section showing a valve body of modifiedconstruction.

The carburetor comprises a float chamber s, a valve casing a and amixing chamber b. The valve casinor guides a hollow semi-cylindricalvalve iody o adapted to rotate about a horizontal axis when actuated byan operating lever r. The valve controls the inlet to the mixing chamberb which is arranged tangentially to the same. Atmospheric air isadmitted to the mixing chamber along the straight side of the valve, asindicated by the arrow I, the admission, which is regulated by a rotaryadjustment of the valve, being dependent upon the distance of the edge yof the valve from the edge .a of the valve casing. In the eXtreme openposition of the valve, additional air is admitted through the valvebody, as indicated by the arrow II, the curved wall of the valve bodybeingprovided with ports c3 whose effective area is also regulated bythe adjustment of the valve. formed with a radial chamber whichcommunicates with a central cone o1. A seat which is made for the latterin the casing a, communicates through a duct f with the float chamberwhich thus maintains the fuel at a level a: in the radial valve chamber.The nozzle d which terminates the chamber is situated at thecircumference of the valve body, near the edge g/ so as to be traversed3y the current of the incoming air. There is also a duct e leading fromthe lower part of the chamber to the circumference of the valve body andopening at a point near the port c3. The valve chamber communicates withthe atmosphere through a narrow duct g opening at the front of the valvebody c.

The valve is ing opened.

With the valve in the `position shown in Fig. 4: the direct airadmission is closed,

and the duct e communicates with the mixing chamber through a chiot m inthe valve casing. The nozzle Z is situated near the level of the liquidand outside the valve casing so that air willbe sucked in through thenozzle and led, together with the necessary fuel, through the ducts eand m to the mixing chamber. The capacity of the duct m can be regulatedby means of a screw lc.

A still further adjustment of the valve body to the right, sets thenozzle body d1 free so that it can be unscrewed for cleaning or forrenewal.

The valve body c is inserted axially into its seat and is heldinposition by a spring o which can be turned aside without tools so asto release the valve and allow it to be removed from the casing. f

In the modified construction of the valve according to Fig. 5, thenozzle Z is situated outside the valve body and forms the onlycommunication of the fuel supply with the mixing chamber t. The orificeis situated somewhat below the edge y within the circumference of thevalve body. Vihile the valve is closed, as shown in Fig. 5, the motorwill act as a brake, for instance while the machine is running downhill.

I claim 1. In a carburetor of the character described, a hollowsemicylindrical valve body having a fuel nozzle arranged radially alongits straight side and circumferential distanced ports, a casing holdingthe valve body rotatively and allowing it to be inserted and withdrawnin axial direction, means for retaining the valve `body in position, thecasing being adapted to admit atomizing air into the mixing chamber pastthe straight side of the valve body in all open positions of the latterand additional air through the ports of the `valve body only in thefully opened position of the same, one Wall of the mixing chamber beingarranged tangentially to the Casing so as to lead the atomizing airacross the fuel jet.

body. n FRITZ SCHNEEBERGER.

